KWA RM4 ERG Charging Handle Spring Retainer
This polymer spring retainer fits all KWA RM4 ERGs and is mechbox part 324 on the diagram.

What the Charging Handle Spring Retainer fits
Match the diagram number in your model’s exploded diagram to be sure you order the right part.
| Model | Diagram no. | All parts |
|---|---|---|
| KWA AEG 2.5 and 3 mechbox | 324 | AEG mechbox parts |
| Radian Model 1 ETU | 324 | Radian Model 1 ETU parts |
| M10 | 324 | M10 parts |
| Q10 | 324 | Q10 parts |
| QRF Mod 1 | 324 | QRF Mod 1 parts |
| QRF Mod 2 | 324 | QRF Mod 2 parts |
| QRF Mod 3 | 324 | QRF Mod 3 parts |
| Ronin T10 | 324 | Ronin T10 parts |
| TK.45 CQB | 324 | TK.45 CQB parts |
| TK.45 Recoil | 324 | TK.45 Recoil parts |
What the Charging Handle Spring Retainer does
What it does
This polymer retainer holds the charging handle spring in place on the mechbox.
When to replace it
- The charging handle does not return forward
- The retainer is cracked or broken
Often replaced together
Small parts wear together. Order them in one go and save a second wait.
Order the right part the first time
- Open Manuals & diagrams and find your model’s exploded diagram.
- Find the part on the diagram and note its number.
- Check the number against the table above, then add the part to your cart. Order by KWA part code M324 (SKU 199-1601-M324).
Work on an unloaded gun with the magazine out and no gas in it. If you are not sure about taking your gun apart, ask KWA support before you start.
Charging Handle Spring Retainer specs
| KWA part code | M324 |
|---|---|
| SKU | 199-1601-M324 |
| Material | Polymer |
| Sold | Individually |
Charging Handle Spring Retainer FAQ
Which KWA models does the Charging Handle Spring Retainer fit?
The KWA AEG 2.5 and 3 mechbox, Radian Model 1 ETU, M10, Q10, QRF Mod 1, QRF Mod 2, QRF Mod 3, Ronin T10, TK.45 CQB and TK.45 Recoil.
What is the Charging Handle Spring Retainer diagram number?
It depends on the model: KWA AEG 2.5 and 3 mechbox part 324; Radian Model 1 ETU part 324; M10 part 324; Q10 part 324; QRF Mod 1 part 324; QRF Mod 2 part 324; QRF Mod 3 part 324; Ronin T10 part 324; TK.45 CQB part 324; TK.45 Recoil part 324. Find your model’s exploded diagram in Manuals & diagrams.
Is it sold individually?
Yes. Each order quantity is one part.
Do I earn KWA Rewards points on parts?
Yes. KWA Rewards members earn 1 point for every $1 on orders of $50 or more, and 50 points = $1 in store credit. Parts, magazines and gas all count toward the order total. See KWA Rewards.



